STABILITY ANALYSIS OF STEEL FRAME STRUCTURES: P-DELTA ANALYSIS

Mallikarjuna B.N, Ranjith A

Abstract: The high rise buildings require high frame structure stability for safety and design purposes. This research focused on P-delta analysis to be compared with linear static analysis. In this study, a 18 storey steel frame structure with 68.9 m has been selected to be idealized as multi storey steel building model. The model is analyzed by using STAAD.Pro 2007 structural analysis software with the consideration of P-delta effect. At the same time the influence of different bracing patterns has been investigated. For this reason five types of bracing systems including X, V, Single Diagonal, Double X, K bracing with unbraced model of same configuration are modeled and analyzed. The framed structure is analyzed for Wind load as per IS 875 (part 3)-1987. After analysis, the comparative study is presented with respective to Maximum storey displacement and Axial Force. The present work showed that the ‘X’bracing in continuous bracing pattern is proved to be more effective with respect to both Static and P-delta analysis.

Keywords: Wind load, Displacement, Axial force, P-delta analysis, Bracings

DOI: https://doi.org/10.15623/ijret.2014.0308007